[Development] heads-up: QtWebKit's SQLite dependency

[Simon Hausmann]

Hi,

QtWebKit requires SQLite for various web related storage mechanism (including 
cookies). That dependency is quite old actually, but we've done some changes 
now that clean up the way that dependency is satisfied. Ideally should affect 
only very few people, but it is quite likely to include folks cross-compiling 
Qt, targetting Linuxy platforms.

The new state of the SQLite dependency union therefore is:

    (1) WebKit will try to use pkg-config to detect and use SQLite from the 
system. Alternatively on Mac OS X sqlite is always availble as a system 
library and conveniently used from there.

    (2) If option number 1 doesn't apply, then we try to see if QtWebKit is 
being built as part of a qt5.git checkout (same applies to release tarballs) 
and we will try to compile in a copy of SQLite right into QtWebKit, the copy 
that's distributed in qtbase/src/3rdparty/sqlite.

   (3) If we also fail to locate Qt's copy of sqlite, then we do require the 
SQLITE3SRCDIR environment variable to be set to point to a location where the 
sources can be found. qtbase/src/3rdparty/sqlite is one such location.


Folks cross-compiling are likely to miss case (1) and might consider enabling 
the use of pkg-config. Folks compiling on Windows should consider building 
under qt5/ or setting the SQLITE3SRCDIR environment variable.



Simon